Determine the average force that the water exerts on the diver

AI Thread Summary
To determine the average force exerted by water on a diver who jumps from an 11.0 m tower and comes to rest 3.0 m underwater, the correct approach involves using the equation mgh = Fd. The diver's total fall distance is the sum of the height of the tower and the depth in the water, totaling 14.0 m. By substituting the values into the equation, the calculation yields the average force as 2048.2 N, which is initially incorrect because the height used was only 11 m. Adjusting the height to 14 m provides the correct average force. The discussion highlights the importance of considering the total distance when calculating forces in such scenarios.
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A 57.0 kg person jumps from rest off a 11.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine the average force that the water exerts on the diver. This force is nonconservative.

i know to use mgh=Fd... i think... but i don't know what distance or height to use or when you are supposed to incorporate the 3.00 m

any help would be apprectiated..
 
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Yeah you're right, mgh = Fd

The distance that the force from the water acts through is 3m, so distance d = 3m.
Stick that into the equation and you are done :D
 
when i do mgh=fd...

(57)(9.8)(11)=f(3)
i get 2048.2 N, but its incorrect. what am i doing wrong?
 
The height dropped in the fall isn't 11m, it is (11+3)m. Does it work now?
 
yes, it worked!
thanks so much :)
 

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